Pet playpen



FIG. 1 is a front, left and top perspective view of a pet playpen, showing my design.

FIG. 2 is a front, right and top perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof.

FIG. 8 is a bottom plan view thereof.

FIG. 9 is an enlarged view of detail 9 in FIG. 1 ; and,

FIG. 10 is another front, right and top perspective view of the pet playpen in a usable state.

The dash-dash broken lines depict portions of the pet playpen that form no part of the claimed design. The dot-dash broken lines in FIGS. 1 and 9 depict the boundary of the enlarged view that forms no part of the claimed design. 

CLAIM The ornamental design for a pet playpen, as shown and described. 